IssuesController::bulk_store: undefined method `async' for #

[diroots]

infos :

When using right clic > export, I get this message

I have setup an imap account, with specific folder defined, connection test OK
no server script defined

setup infos :

Environment:
  Redmine version                3.4.6.stable
  Ruby version                   2.1.5-p273 (2014-11-13) [x86_64-linux-gnu]
  Rails version                  4.2.8
  Environment                    production
  Database adapter               Mysql2
SCM:
  Git                            2.1.4
  Filesystem                     
Redmine plugins:
  clipboard_image_paste          1.13
  computed_custom_field          1.0.6
  redmine_checklists             3.1.11
  redmine_ckeditor               1.1.5
  redmine_issue_dynamic_edit     0.6.5
  redmine_issue_to_email         1.0.1
  redmine_issues_tree            0.0.12
  redmine_lightbox2              0.4.3
  redmine_slack                  0.2
  redmine_user_import            0.1.0

[AndreiG74]

+1